在较高温度下，燃料与（）接触，更容易导致燃料中不安定成分的氧

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问题单项选择题

在较高温度下，燃料与（）接触，更容易导致燃料中不安定成分的氧化，生成沉淀物，破坏燃料质量。

A.空气、水分

B.防冰添加剂

C.抗静电添加剂

D.空气、金属

答案

参考答案：D

填空题

用所给单词的恰当形式填空。

1. Kate's brother ___________ (have) a nice computer.

2. Where ___________ (be) your clothes?

3. Look at the map of ___________ (Chinese) on the wall.

4. The ___________ (child) are very happy. It's their holiday (节日).

5. His ___________ (parent) are office workers.

6. Mr. White ___________ (go) to work on foot every day. But he ___________ (go) there by

bike this morning.

7. Listen! The students ___________ (play) the guitar now.

多项选择题

对血压维持起重要作用的因素有()

A．总外周血管阻力

B．血容量

C．心输出量

D．血浆电解质

E．中枢神经系统